[http] HttpConnection: disable opportunistic write() calls.
[http] HttpConnection: disable opportunistic write() calls.

// I would really like to send write-syscalls optimistic.
// However, if a write fails, it is going to trigger the abort/connection-close sequence,
// which *might* result into a request/connection destruction, which it shouldnt.
// and not every code section is able to let the connection not destroy himself
// too soon.
//
// I should add ref()/unref()/refCount() whose only use would be to prevent
// destructing too early (because code paths will still use it).
// And if the last unref() zeroes, it could destruct itself right away.
// We do not need any locking for this because a connection (and its requests)
// is always handled by the same worker thread.

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